Abstract
Jet impingement boiling is investigated with regard to heat transfer and pressure drop performance using a novel laser sintered 3D printed jet impingement manifold design. Water was the working fluid at atmospheric pressure with inlet subcooling of 7oC. The convective boiling performance of the impinging jet system was investigated for a flat copper target surface for 2700≤Re≤5400. The results indicate that the heat transfer performance of the impinging jet is independent of Reynolds number for fully developed boiling. Also, the investigation of nozzle to plate spacing shows that low spacing delays the onset of nucleate boiling causing a superheat overshoot that is not observed with larger gaps. However, no sensitivity to the gap spacing was measured once boiling was fully developed. The assessment of the pressure drop performance showed that the design effectively transfers heat with low pumping power requirements. In particular, owing to the insensitivity of the heat transfer to flow rate during fully developed boiling, the coefficient of performance of jet impingement boiling in the fully developed boiling regime deteriorates with increased flow rate due to the increase in pumping power flux.
Highlights
Air cooling of high performance electronic components is becoming progressively more obsolete
To quantify the effect of Reynolds number on heat transfer performance, tests were carried out at three different flow rates corresponding to Re= 5400, 4050 & 2700
The boiling curves tend to merge which is consistent with earlier literature that found the heat transfer performance to be independent of the Reynolds number [4, 17]
Summary
Air cooling of high performance electronic components is becoming progressively more obsolete. With highly wetting fluids, such as R134a, the performance during fully developed boiling was found to be dependent on the Reynolds number [12, 13], with the higher Reynolds numbers providing better heat transfer performance This partially confirmed the earlier work of Wolf et al [5] who noted that the heat transfer performance was dependent only on the characteristics of the surface and the liquid used rather than on the jet velocity, subcooling, nozzle or heater dimensions [6]. It was shown that while retaining the total jet velocity free area, an increase in the number of nozzles increased heat transfer performance This came with the penalty of an increase in the pressure drop. The motivation for this study is to investigate both the heat transfer and hydraulic performance of confined jet array impingement boiling
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